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          <h1 class="post-title" itemprop="name headline">代理模式</h1>
        

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        <p>代理模式是设计模式中的一种，提供了对目标的间接访问，这样做可以实现通过代理对象实现对目标对象的访问。在生活中，也有类似的例子。比如我们需要去超市买东西，但是厂家是把商品委托给超市的，超市就成了一个代理对象，我们只要去超市就可以购买各种各样的商品了，不需要去不同的厂家一一购买。代理模式也是这样，通过一个代理对象就可以实现对目标对象的访问了。代理模式分为静态代理和动态代理。静态代理在程序运行之前关系就已经确定了，动态代理可以在运行时动态的修改。<br>1.静态代理</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br></pre></td><td class="code"><pre><span class="line">public interface IGoods &#123;</span><br><span class="line">    void sell();</span><br><span class="line"></span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">public class Factory implements IGoods &#123;</span><br><span class="line">    @Override</span><br><span class="line">    public void sell() &#123;</span><br><span class="line">        System.out.println(&quot;我是一件商品，正在从工厂出售&quot;);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">public class Proxy implements IGoods &#123;</span><br><span class="line">    @Override</span><br><span class="line">    public void sell() &#123;</span><br><span class="line">        Factory factory = new Factory();</span><br><span class="line">        factory.sell();</span><br><span class="line">        System.out.println(&quot;我是一件商品，正在从工厂出售&quot;);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">public class Main &#123;</span><br><span class="line">    public static void main(String[] args) &#123;</span><br><span class="line">    Proxy proxy=new Proxy();</span><br><span class="line">    proxy.sell();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>以上就实现了一个静态代理模式，通过Proxy类代理Factory类,我们操作代理对象就可以实现对目标对象的调用</p>
<p>2.动态代理<br>当我们需要的代理目标越来越多的时候，如果使用静态代理就需要很多的代理类，因此有了动态代理，动态代理是使用反射，使用一个代理类代理所有的目标，方便管理。<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br></pre></td><td class="code"><pre><span class="line">public class ProxyHandler implements InvocationHandler &#123;</span><br><span class="line">    private Object target;</span><br><span class="line"></span><br><span class="line">    public ProxyHandler(Object target) &#123;</span><br><span class="line">        super();</span><br><span class="line">        this.target = target;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    @Override</span><br><span class="line">    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable &#123;</span><br><span class="line"></span><br><span class="line">        return method.invoke(target, args);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">public class Main &#123;</span><br><span class="line">    public static void main(String[] args) &#123;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">        Factory factory=new Factory();</span><br><span class="line">        ProxyHandler handler=new ProxyHandler(factory);</span><br><span class="line">        IGoods goods= (IGoods) Proxy.newProxyInstance(IGoods.class.getClassLoader(),new Class[]&#123;IGoods.class&#125;,handler);</span><br><span class="line">        goods.sell();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>

      
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